Sion passive needs to be better.
Could Sion's passive be any more useless? Sure you gain back all your health upon dying to get a 2nd shot at killing your opponent but you can't kill the if every time you auto attack you stop moving and thus have to catch up to your foe again but you can't do that because you're dead for blood loss.
Even with furor or even Blade of the Ruined King, you can barely catch up because when you auto, you stop running and thus makes you passive a big waste of time, and since you can get stunned whilst in this mode, it just makes you even more useless.
I'd say that once you're in your passive form, you should be immune to crown control effects as you can barely kill a champion you're chasing but even if you do have the chance of killing them, if they have any form of crowd control, you're done for and they will get away.
I'm not saying Sion is bad, i really much do enjoy the new Sion but the passive just frustrates me as i can never seem to kill a player as i always get outran from being slowed and or stunned.